Read my post above. The directory name (or path) where the "iconengines" directory is located doesn't matter. All that matters is the existance of "iconengines" directory in one of the directories in the library search path.

Quote Originally Posted by tzioboro View Post
But I want to have iconengines in plugins directory. So what should I do ?
Short answer: you can't.

Long answer: Take a look at QCoreApplication sources. Plugins are loaded from within there. Maybe you can load the plugin yourself from a custom location.

Medium answer: compile the plugin statically into your application (see "static plugins" in the docs).